Sliding gate-valve



(No Model.)

` J. OLD.

y SLIDING GATE VALVE. Y No. 332,939. PatentedDeo. 22, 1885.v

INVENTOR.

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JAMES OLD, OF ALLEGHENY, PENNSYLVANIA.

SLIDING GATE-VALVE.

l,SiPIEICIFICATION forming part of Letters Patent I No. 332,939, datedDecember 22, 1885.

Application lell March 13, 1 885. S. rial No. 158,675. (Xo model.)

To all whom it may concern.-l

Be it known that I, JAMES OLD, a citizen of the United States, residingat Allegheny, in the county of Allegheny and State of Pennsylvania, haveinvented or discoveredl certain new and useful Improvements inGate-Valves, of which improvements the following is a specification.

In the accompanying drawings, which make part of this specification,Figure 1 is a central sectional View of my improved form of gatevalve.Fig. 2 is an end elevation, partly in section, of the valve. Fig. 3 isan edge View of the ball-bearing. Fig. 4 is an edge view of thesupportingyoke with the ball-bearing and valve-plates in place. Fig. 5is aperspective view of one of the valve-plates. Fig. 6 is a side Viewof a modified form of supportingyoke. Fig. 7 is a sectional elevation ofthe yoke and valve-disks.

My invention relates to that class of valves termed gate7 orstraightening77 valves, in which the valvedisks are wedged against theirseats by a movement of the supportingyoke at right angles to the iiow ofthe fluid through the Valve case; and the object of my invention is toso construct the disks, their bearings, and the supporting-yoke as topermit entire freedom of movement of the disks in their seatingmovement, thereby allowing said disks to accommodate themselves to anyirregularities of the seats. A

Within the case 1, which is of the usual form, is provided aValve-chamber, 2, opening on two sides into the sockets 3, into whichare inserted the ends of pipes. The innersurfaces of the Walls of theseopenings from the valve-chamber form annular seats 4 for thevalve-disks, said seats being formed at an angle to each other andconverging at the lower end of the valve-chamber, as shown in Fig. 1.

The top of the case is provided with a threaded socket, 5, for thereception of the cap 6, and in the upper portion of said cap is formedthe stuffing-box 7. Through the stuffing-box and cap passes theValve-stem 8, provided at its lower end with suitable threads forengagement with the yoke 9. On the valve-stem above the screw-threads isformed a collar, l0, constructed to t in a socket in the cap 6, saidcollar being held loosely Within the socket by the annular nut 12, andthereby locking the valve stem as against longitudinal movement, butpermitting of perfect freedom as to rotary movement. f

The yoke 9, which consists of an annularr piece of metal, is providedwith an interiorlythreaded knob or projection, 13, into which screws thethreaded portion of the valve-stem 8, and by the rotation of the stemwhich is held as against longitudinal movement, as above stated, theyoke is drawn up into the upper part of the valve-chamber. Within theyoke 9 is placed the ball-like bearing, consisting of two segments, 14.of a globe or ball arranged on opposite sides of a disk, 15, said diskand segments being formed in one piece, as shown, by which constructionas perfect freedom of movement of the valve-disks on the bearings 14 isattained as if a complete sphere or globe was used. `and a considerablesaving of space is attained.

The Valve-disks or plates 16 lare made of a size somewhat larger thanthe openings between the valve-chamber and the sockets 3,

and are provided on their rear sides with proy jections 17, in which areformed the curved recesses 18, for the reception of a portion of theball-bearing 14, the curvature of the sides of said recess being -t-hesame as that of the ball. One of these disks is placed on each side ofthe yoke, as shown, the curved portion of the ball projecting into andbearing upon the sides of the recess 18 in the projection 17 of eachdisk, the length of projections 18 and the diameter of the ball in linewith such projections being so proportioned with relation to thethickness of the annular portion ofthe yoke that the disks will haveconsiderable vibratory movement or play on the ball -bearing Theprojections 18 serve as bearings or journals for the support of thedisks in the yoke, as clearly shown in Fig. 1.

The yoke, ball, and disks having been placed together, as shown in Fig.4, they are placed within the valve-chamber, the disks bearing againstthe seats et in said chamber. Those seats at their tops are such adistance apart that the disks will stand nearly parallel when raised, soas to permit the iiuid to pass through the Valve-chamber; but when theyoke is forced down the disks are caused to frotate on the ball-bearingby the inclined IOO v movement, either rotary or vibratory, of the ltions which played in the disk-seats, so that seats 4, and assume awedge shape, as in Figs. l 1 and 4, and by the time the yoke has reachedthe lower part of the valve-chamber and the disks cover the openingsbetween said chamber and the end sockets of the valve-case said diskswill have been forced tightly against the seats 4. In making the valvecase sufficient space should be allowed in that portion of thevalve-chamber below the seats 4 to allow of the yoke being forcedfarther down as the seats or valves wear, and thusinsuring a tightseating of the valve.

Vhen a screw-stem is employed for raising and lowering the yoke, asshown in Figs. 1 and 2, an opening (shown indotted lines, Fig. 3)somewhat larger than the diameter of such stem should be formed throughball-bearing for the reception of said stem when the yoke is raised; butwhen a sliding stem, 19, (either with or without the lower guide, 20, asshown in Fig. 6,) is employed the hole or opening through the ball maybe omitted. In case the lower guide-stem, 20. is employed an'openingprovided with a suitable stufngbox is made through the lower end of thevalve-chamber.

In some instances it is desirable that the disks should be so secured tothe yoke as to prevent their being lost when taken out of the case orbecoming displaced while within the case. I therefore form undercutgrooves 21 in lugs 22, formed on the side of the annular portion of theyoke, and a circular groove, 28, around the projection 17 on the valvedisks or plates, said groovesin the yoke and disks being in line whenthe latter are in position, and then into said grooves is'slidthekey24,therebylock ing t-he disks and yoke together. The groove 23 shouldbe so constructed as to permit free disks.

I am aware that valvedisks with concave inner seats have been combinedwith an operating-stem having semi-spherical projecin connection withthe valve'seats proper the valves responded to movements of the stem;

but in such cases there was no connection between the disks and thestem, except one of surface-contact. In my present improvement I add ajointed connection from one to the other. Thereby they are held togetherwhen detached or separate from the case, either before being pnt intothe case or after being taken out, which element in the fitting up,putting together, and taking apart for repairs or other purposes is oneof importance and evident utility.

I claim herein as my invention- 1. In a gate-valve. a case havinginclined valve-seats, in combination with a reciprocating yoke havingwedge-shaped sides, a bearing having convex ball-shaped sides looselymounted in said yoke, the two disks arranged outside of the yoke onopposite sides thereof, and provided with concave seats for thereception of the ball-bearing, substantially' as set forth.

2. In a gate-valve, the combination of a yoke, a disk on each side ofthe yoke, a balland-socket bearing back of each disk, and a jointedconnection uniting or tying each disk to the yoke independently of thevalve-seat bearing, substantially as set forth.

3. In a gate-valve, a reciprocating yoke, in combination with Valvedisks16, provided with journal projections 17, adapted to t within the yoke,a ballbearing arranged between the disks and within the yoke and the key24, engaging the disks and yoke and serving to hold them in looseconnection, substantially as set forth.

4. In a gate-valve, a reciprocating yokehaving guide-stems 19 and 20,arranged on opposite sides thereof, in combination with a bearing havingconvex sides, and two valvedisks arranged one on each side of the yokeand provided with convex seats for the reception of the ball-bearing,substantially as set forth.

In testimony whereof I have hereunto set my hand.

JAMES OLD.

Witnesses:

DARWIN S. WoLoorT, R. H. VVHITTLESEY.

